Make sure protobuf comes from pypi

Without this, it gets the outdated zip package from googlecode and fail.
Merge pull request #183 from basho/eas-allow-hosts-pypi

Make sure protobuf comes from pypi
add rich comparison methods to client/bucket/riakobject
Merge pull request #185 from glassresistor/feature/rich_comparison

add rich comparison methods to client/bucket/riakobject and added tests